国家对严重危及施工安全的工艺、设备、材料实行（ ）制度。
A
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Togetthejobstarted,____Ineedisyourpermission.
Thereisatree____agroupofLeaguemembersoftenplaychess.
Wethankyou_____foryoucooperation.
Hepaidtheboy$10forwashingtenwindows,mostof____hadn'tbeencleanedforatleastayear.
Youcantakeanyseat____isfree.
